Piano action



5 SheetsSheet 1.

(No Model.)

A. BIESE & K. G. ZIEROLD.

PIANO ACTION.

No. 294,004. Patented Feb. 26, 1884.

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A. BIESE & K. G. ZIEROLD.

PIANO ACTION.

No. 294,004. Patented Feb. 26, 1884.

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(No Model.)

5 SheetsSheet 3. A. BIESE 8: K. G. ZIEROLD. PIANO ACTION.

No. 294,004. Patented Feb. 26, 1884.

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Patented Feb. 26, 1884.

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PIANO ACTION. No. 294,004. Patented Feb. 26, 1884.

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ALFRED BIFSE, OF BER-LIN, AND KARL GUSTAV ZIEROLD, OF LETPSIQ,

GERMANY.

PIANO-ACTiON.

SPECIFICATION forming part of Letters Patent No. 294,004, dated February 26, 1884.

Application filed March 7, 1833. (No model.)

T0 aZZ whom, it may concern:

Be it known that we, ALFRED BIESE, residing at Berlin, and KARL GUsn-lv ZIEROLD, residing at Leipsic, both in the German Empire, and citizens of Germany, have invented new and useful Improvements in Piano-Fortes, of which the following is a specification.

This invention relates to piano-actions; and it consists in the construction and combination of the parts substantially as hereinafter set forth.

In the accompanying drawings, Figure 1 is a side view of a piano-action when at rest. Fig. 2 is a top view of the same. Fig. 4c is a side view of the action when the key is pressed down. Fig. 5 is an enlarged view of the hammer and hammer-fly. Fig. 6 is a top view of the bottom iron frame. Fig. 7 is a section of the same at line S S, Fig. 6. Fig. Sis a crosssection of the same at line T T, Fig. (3. Fig. 9 is a top view or plan of the upper frame. Fig. 10 is a longitudinal section of the same at line P P, Fig. 9. Fig. 11 is a cross-section of the same at line H H, Fig. 9. Fig. 12 is a top view or plan of the upper and lower frame attached to each other. Fig. 13 is a longitudinal section of the same at line K K, Fig. 12. Fig. 14 is a longitudinal end view of the same; and Fig. 15 is a cross-section of the same at line N N, Fig. 12. Figs. 3, 16, 17, and 18 represent additional detail views.

Similar letters represent similar parts in all the figures.

A is the keylever; B, the hammer-fly hinged at c to the lly-foot b, which latter is attached to the key A.

E is the cross-bar, to which the feet of the hammers are attached.

D is the hammer; D, the hammer-rod, and J the hammer-butt hinged at (Z to its feet.

h is the back check and h is the cushion for the hammer, after the same is released from the action of the key-lever and fly B.

To the hammer-butt J a spring, f, is attached, provided with a button, e, at its end, acting upon a suitable projection, i, provided on the hammer-fly B.

G is the cushion of the hannneubutt J, and is acted upon by a screw-bolt, s, so that said cushion G maybe moved farther away or closer to the hammer-butt J, as may be desired, for the purpose of increasing or diminishing the force of the blow of the hammer against the strings X. hen the key-lever A has been operated and the fiy B has operated upon the hammer, the fly glances off, allowing the hammer D to fall back away from the string X only a very short distance, when the same is caught by the back check, It. At the same time the button 1; of the spring f, acting upon the projection of the hammer-fly B, forces the fly back again under the end of the cushion G and supports the hammer D in that position, thereby enabling the performer to strike again and repeating as many times as he may choose by a very slight motion of the key, without the necessity of allowing the key-lever to return to its original position. The action of the'spring f propels at the same time the 11ammer with greater force against the string.

To increase the sound of the instrument, and at the same time be able to counteract the effect of any change of temperature upon the sounding-board, we arrange this soundingboard R between two frames, F and Q. This sounding-board R is placed upon the lower frame, F, into a recess formed by the projecting edges 7.; of said frame, the forward end of the sounding-board being supported by the wooden cross-bar w, Fig. 13, supported in suitable recesses, g g, made in the longitudinal braces 71, Fig. 6, of said frame. By the arrangement of this wooden cross-barw the metallic sound is likewise prevented. The upper framing, O, strengthened by suitable longitudinal braces, h, rests upon the lower frame, F, 011 its projecting edges 7., and is firmly secured to the same by means of screws or bolts 6. In the longitudinal braces h of the upper frame, Q, bosses a are arranged, through which bolts or screws 02, Figs. 13 and 15, pass, bearing upon the longitudinal braces h of the lower frame, F, and capable of being regulated by suitable nuts, on, whereby the strain of 2 v asaoon these frames and Q maybe increased or (11- back of said cushion, to regulate the stress oi minished, as may be desired. said spring, substantially as set forth.

WVhat We claim as our invention, and desire ALFRED BIESE. to secure by Letters Patent, is KARL GUSTAV ZIEROLD. 5 I11 a piano-action, the combination of the YVitnesses as to Alfred Biese:

hammer-butt, hammer-fly, and interposed B. ROI, spring with the cushion G, attached to said G. H. SMITH. hammer-butt, and receiving the pressure of \Vitnesses as to Karl Gustav Zierold: said spring, and the adjustingscrew, which XV. WVOHLFORTH, 10 Works through said hammer-butt against the E. LINKE. 

